Author Affiliations
Abstract
1 Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2 University of Sciences and Technology of China, Hefei 230026, China
3 Troop 61741 of PLA, Beijing 100094, China
4 Shanghai Maritime University, Shanghai 201306, China
In order to improve the frequency and precision of radiometric calibration, the automated vicarious calibration system (AVCS) is developed and deployed at the Dunhuang test site to perform vicarious calibration without the in situ manned measurements. The surface and atmospheric parameters are automatically collected by AVCS. An absolute radiometric calibration approach based on AVCS is proposed. Six successful calibrations of the Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) are conducted. The results are in good agreement with the on-board calibration system with all the relative differences less than 4%. It enables us to monitor the change of a sensor over long time scales.
010.0280 Remote sensing and sensors 280.4788 Optical sensing and sensors 120.0280 Remote sensing and sensors Chinese Optics Letters
2017, 15(10): 100101
中国科学院安徽光学精密机械研究所 中国科学院通用光学定标与表征技术重点实验室, 安徽 合肥 230031
星载激光高度计广泛地用于多种地形地貌的科研分析,例如冰层和植被覆盖变化。针对星载激光高度计数据的定量化应用,研究了激光 高度计的定标方法,并设计了激光高度计地面定标模拟系统加以验证。该系统包含探测器阵列和高精度脉冲计时系统两部分,用于定标星载 激光高度计的对地指向角和时间戳。对定标系统的性能进行实验测试和软件仿真,结果显示:探测器能够探测平均能量3 nJ/cm2的光斑,探测范围 为1～16 nJ/cm2,计时系统计时精度为1.25 ns。
激光高度计 地面定标 足印定位 高精度计时 laser altimeter ground-based calibration footprint location accuracy of timing 大气与环境光学学报
2017, 12(4): 313
1 中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室，安徽 合肥 230031
2 中国科学技术大学，安徽 合肥 230031
采用自动化场地辐射计（ATR）测量地表反射，结合CE318型太阳光度计获得的大气参数和漫总比辐照度仪获得的漫总比数据，计算出卫星过顶时刻的高光谱地表反射率。基于反射率基法对中分辨率成像光谱仪(MODIS)/Aqua和MODIS/Terra的可见光至近红外波段1~7开展了场地自动化观测绝对辐射定标试验。结果表明，利用场地自动化观测定标方法获取的表观辐亮度与MODIS/Aqua、MODIS/Terra星上获取的表观(TOA)辐亮度的相对偏差不大于4%。这说明场地自动化观测定标方法与人工定标方法具有同等水平的定标精度，验证了场地自动化观测定标方法的可行性。
大气光学 辐射定标 反射率基法 自动化观测
